Forging is a processing method that uses a forging machine to apply pressure to a metal blank to cause plastic deformation to obtain a forging having certain mechanical properties, a certain shape and size.

Casting - smelting metal, making a mold, and pouring molten metal into a mold, and solidifying to obtain a blank of a metal part having a certain shape, size and performance

Comparison: Metals can improve their microstructure and mechanical properties after forging. After the hot-working deformation of the cast structure by the forging method, the original coarse dendrites and columnar grains become the equiaxed recrystallized structure with fine grains and uniform size due to the deformation and recrystallization of the metal, so that the original segregation in the steel ingot, The compaction and welding of loose, stomata and slag inclusions make the structure more compact and improve the plasticity and mechanical properties of the metal.

The mechanical properties of castings are lower than those of forgings of the same material. In addition, the forging process can ensure the continuity of the metal fiber structure, so that the fiber structure of the forging piece is consistent with the shape of the forging piece, and the metal streamline is complete, which can ensure the good mechanical properties and long service life of the part by precision die forging and cold extrusion. Forgings produced by processes such as warm extrusion are incomparable to castings.